Diazotizable primary disazo dyestuffs



:20. acetate or ethyl oXalyl-acetateand subsequent l combmatlon oi the intermediate products of Patented Feb. 10, 1931 UNITED. STATES MELGHIQR IBOEN'IG-ER, OF'BASEL, SWITZERLAND, ASSIGNORIIG THE FIRM; CHEMICAL rwORKs' FoRllll'ERbY SANIDOZ', OFBASEL, SWITZERLAND DIAZOTIZAIBLE PRIMARY" DISAZO DYESTU'FFS facture of diazotizable azo-dyestufisfiamino-4-Inethyl-5'-sulpho-1 phenyl-5 pyrazolones, correspondingto the general formul-a V om HOaS NH:

obtained by condensation of 2-nitro-4-tolyl hydrazine-G-sulphonic acid with ethyl aceto reduction. 7

By coupling one molecule of a tetrazodiaryl with two molecules of these 3-amino-4-methyl-5-sulpho-1-phenyl-5-pyrazolones or by one molecule of a tetrazodiaryl and one molecule of an arylortho-hydroxycarboxylic acid with one molecule of a 3-amino-4-methyl-5- sulpho-l-phenylrapyrazolone or by coupling the intermediate product of one molecule-of a tetrazodiaryl and one molecule of a 3-amino- 4-methyl-5-sulpho l-phenyl 5v-py razolone with one molecule of an azo component valuable substantive azo-dyestuffs are obtained,

' which when diazotized on the fibre can be 40, w 7 i dark brown, which are fast to washing and developed with unsulphonated azo components for instance betanaphthol, metadiamines, phenylmethylpyrazolone to shades varying from orange to red, heliotrope and can be discharged with formaldehyde-hydrosulfite to pure white effects.

Furthermore, the direct dyeings can also .be fixed with formaldehyde or by ,an after 1 -phenyl-5-pyrazolones by the corresponding 3- nitro -4 4methyl1-5'-sulph o-lsphenyl 5 pyrazolones, and; by: reducing in, the, nitro-d-yer No Drawing. Application filed April 2, 19.26, Serial N'o. 99,383, and in GreatBritain; February 19; 1926.

stufis thus-obtained'the nitro grouptotheamino-groupby an appropriate treatment with V sodium sulphide .Ihe e di ot z bl azo-dyc tufiscons itute. in a dry. state, brick red tolbrown black powders easily soluble in water with orange toviolet brown, colour and dissolving-in concentrated sulphuric acid with red violet to 7 dark blue colorations.

The following examples illustrate the invention the parts being by weight:

Ewample 1 Diazotize 24.4 parts of dianisidine and add to the solution thereby obtained at;-5F-- C.-

the neutral solution, ofthetrisodium salt corresponding at 62.6 parts ofi-3-amino-14"- methyl 5 sulpho I phenyl-5-pyrazolone-3- carboxylic acid. After stirring during an hour, the combination is finished, Add the QIU-tiQ luQfrZ .par s o sod um ca bona e,

heatto hailing and, precipitate from the "dark violet/solutionanddyestufiby m an io m.- mon salt, 'e I V I It, Constitutes infdry state, abrown-bhck.

powder, easily solublein water with red-' violet colour, whereaszit dissolves in concentrated sulphuric acid with blue coloration.

It produces on unmordanted cottonfheliotropew shades, which by diazotizing on the fibre and. developing with betanaphtholfbe-f come vvery fast to washing without changing materially in tone. v

The dyestuflt obtained according tothis example-has thefollowingformulaz' V on. r Y on HiN .SQa no. NH,

Examp e 2 in sodium carbonate solution to form the intermediate product. As soon as its formation is complete, the solution of the disodium salt of 28.3 parts of 3-amino-4-methyl- 5-sulpho-1-phenyl-3-methyl-o-pyrazolone is with yellow-orange, in concentrated sulphuric acid with red-violet coloration.

It dyes unmordanted cotton bright orange shades; diazotizedon the fibre they can be developed with beta-naphthol to reddish orange shades, fast to washing. Compared with the corresponding dyestufi from 2 methyl-3-amino -5- sulpho-1-phenyl-3-meth yl-o pyrazolone-they are substantially redder in tone, in direct as well as in developed dyeings.

he dyestuff obtained according to this example has'the following formula:

HOaS

p 2111 HO-O COOH.

Ewample 3 cipitated, which is coupled to the disazo-dyestuff by addition of 24.5 parts of 1.6 (1.7) naphthylamine sulphonic acid sodium salt dissolved in 250 parts of water. The nitro disazo-dye hereby obtained forms a brownish black precipitate. In order to reduce the nitro group, add to the nitro disazo-dyestuff rendered slightly alkaline with sodium carbonate, parts of crystallized sodium sulphide, heat slowly up to 50 C. and maintain this temperature until the sodium sulphide has dissappeared. Neutralize the brown solution with muriatic acid and precipitate the amino pyrazolone disazo-dyestuif thus obtained by means of common salt.

It constitutes in dry state a brown-black powder, which dissolves in water with yellowbrown, in strong sulphuric acid with violet The dyestulf obtained according to this example has the following formula:

HO3S- am,

I N 3 Hop CH3 CH Borg =N NN.c---o.oni 03H 1' i i Example 4 21.2 partsof tolidine are diazotized and combined with 15.5 parts of orthohydroxycresotinic acid in sodium carbonate solution to the intermediate product. As soon as free tetrazoditolyl can no more be traced, the sodium carbonate solution of 3 1.3 parts of 3-amino--methyl-5-sulpho-1-phenyl-5 pyrazolone-3-carboxylic acid is added. After stirring during some, hours, the combination is completed. Heat up to boiling and precipitate the dyestulf by means of common salt. It forms in dry state a red-brown powder, dissolving in water with brown-red, in concentrated sulphuric acid with violet coloration.

It dyes unmordanted cotton red shades, which by 'diazotizing and developing with betanaphthol are fixed to bright scarlet shades, fast to washing and light;

The dyestufl' obtained according to this example has the following formula:

H 058 NHz I I COOH What I claim is:

1. The herein described new diazotizable primary disazo-dyestufis'as obtained by coupling a tetrazotized diamine of the diaryl series and at least onemolecule of a 3-amino- 4-methyl-5'- sulpho l phenyl 5 pyrazolone and an azocomponent and having most probably the following general formula:

HOgS NH:

wherein R stands for CH or COOH, X

stands for hydrogen, CH or OCH-I and R stands for an azocomponent, dyeing unmordanted cotton in orange to red shades, which,

HaN

OOH

wherein R stands for CH or COOH, X

stands for hydrogen, CH or OCH and R stands for hydrogen or CH dyeing unmordanted cotton in orange to red shades, which when diazotized on the fibre can be developed to similar shades, fast to washing, constituting in the form of their sodium salts brick red to brown black powders, easily soluble in water with orange to violet brown colour,

and dissolving in concentrated sulphuric acid with red violetto black violet coloration.

3. The herein described new diazotizable primary disazo-dyestuifs as obtained by coupling one molecule of a tetrazotized diaInine of the diaryl series with one molecule of a 3amino-4;emethyl-5'-sulpho-1-phenyl-5-pyrazolone and one molecule of a methylorthohydroxycarboxylic acid, said dyestuffs having the general formula:

X X 0 0-011 Ha 11 lg 111-0- N=N N=N- OH O OH wherein R stands for CH or COOH and X stands for hydrogen, CH or OCH dyeing unmordanted cotton in orange to red shades which when diazotized on the fibre can be developed to similar shades, fast to washing, constituting in the form of their sodium salts brick red to brown red powders, easily soluble in water with orange to brown red colour,

and dissolving in concentrated sulphuric acid with red violet to violet coloration. i

In witness whereof I have hereunto signed my name this 22nd day of March, 1926.

MELCHIOR BOENIGER. 

